For a confidence interval of 5.4 +/- 0.2 find the % confidence level if the standard deviation is 1.3 and n = 100
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For a confidence interval of 5.4 +/- 0.2 find the % confidence level if the standard deviation is 1.3 and n = 100
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- A sample data set, n = 115, shows human body temperatures with a mean of 99.6ºF. If the standard deviation σ is known to be 0.75ºF. Find the 99% confidence interval for μ.Find the lower limit of 95% confidence interval. An SRS of 36 students were taken from high schools in a particular state. The average test score of the sampled students was 60 with a standard deviation of 13.26. Give the lower limit of the interval approximation.A sample of 45 individuals at a shopping mall found that the mean number of visits to a restaurant per week was 2.69 with a standard deviation of 1.65. Find a 95% confidence interval for the mean number of restaurant visits. A 95% confidence interval for the mean number of restaurant visits is (Use ascending order. Round to two decimal places as needed.)
- With a large sample (N>30), the Excel function CONFIDENCE.T is used to calculate the confidence interval. True or FalseA random sample of 10 children found that their average growth for the first year was 9.8 inches, with a standard deviation of 0.96 inches. Find the 85% confidence interval of the mean growth of all American children in the first year of life.What is the name of the confidence interval?The president of a large university wishes to compare the standard deviation of the ages of students presently enrolled to previous years. The distribution of ages has been approximately normal. Find the 90% confidence interval for the population standard deviation of the student ages of the University. A random sample of 20 university students has a standard deviation of 6.1 years in a mean of 23.8 years what is the confidence interval of the population standard deviation?
- A researcher wants to make a 95% confidence interval for the population mean. She wants the maximum error of estimate to be within 4.8 of the population mean. The population standard deviation is 18.65. What would be the sample size the yield a maximum error of estimate within 4.8 of the population mean?a sociologist found that in a sample of 45 retired men, the average number of jobs they had during theirlifetimes was 7.2. The population standard deviation is 2.3.Find the 90% confidence interval of the mean number of jobs. Round intermediate and final answers to one decimalplace.<h<Assume the height of men is normally distributed. A random sample of 25 men had an average height of 72.5 with a sample standard deviation of 4.0. Form a 95% confidence interval on the population mean. 5.
- One year, the mean age of an inmate on death row was 38.1 years. A sociologist wondered whether the mean age of a death-row inmate has changed since then. She randomly selects 32 death-row inmates and finds that their mean age is 36.9, with a standard deviation of 9.8. Construct a 95% confidence interval about the mean age. What does the interval imply? A Click the icon to view the table of critical t-values. Choose the correct hypotheses. Но (Type integers or decimals. Do not round.)Overweight Men For a random sample of 70 overweight men, the mean of the number of pounds that they were overweight was 29. The standard deviation of the population is 4.3 pounds. Find the 90% confidence interval of the mean of these pounds. Round intermediate answers to at least three decimal places.A recent survey of 25 students showed that they spent an average of $18.53 on petrol eachweek. The standard deviation of the sample was $3.00. Find the 99% confidence intervalfor the true mean (average over all students).
